Chronic social stress during early development elicits unique behavioral changes in adulthood

Area of Science:

• Neuroscience
• Behavioral Science
• Developmental Psychology

Background:

• Chronic social stress can cause brain inflammation.
• Early-life stress impacts adult brain function and social behavior.

Purpose of the Study:

• To investigate the link between childhood social stress and adult social behavior.
• To characterize adult behavioral phenotypes in mice subjected to sequential early-life social stresses.

Main Methods:

• Mice underwent maternal separation (MS), social defeat (SD), and social isolation (SI) sequentially.
• Evaluated body weight, anxiety, depression, locomotion, learning/memory, and repetitive behaviors.
• Assessed sociability, social interaction, aggression, and social fear.

Main Results:

• MS/SD/SI mice showed reduced body weight compared to controls.
• Exhibited normal anxiety, depression, and learning, but increased locomotion and reduced repetitive behaviors.
• Displayed increased social interaction, impaired empathy-related fear, reduced predator fear, and heightened defensive aggression.

Conclusions:

• Childhood social stress induces significant behavioral alterations, particularly in social behaviors.
• MS/SD/SI mice model unique social abnormalities relevant to child abuse or maltreatment.
• These mice can serve as a model for studying social stress, brain inflammation, and psychosocial behaviors in disorders like psychopathy.